package com.itheima.demoStringBuilder;

public class Test {
    public static void main(String[] args) {
        /*int[] arr1 = {1,2,3};
        int[] arr2 = arr1;
        System.out.println(arr2[3]);*/
        StringBuilder sb1 =new StringBuilder("abc");
        StringBuilder sb2 =new StringBuilder("ABC");
        sb1.append(sb2);
        System.out.println("sb1:" + sb1 + "    sb2:" + sb2);
    }
}
